Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{PORMA_1953__12_3_114720, author = {Lyndon, R.G.}, title = {On the {Frouxe-Rabinovitch} series for free groups}, journal = {Portugaliae mathematica}, pages = {115--118}, publisher = {mathdoc}, volume = {12}, number = {3}, year = {1953}, mrnumber = {0061111}, zbl = {0051.25504}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1953__12_3_114720/} }
Lyndon, R.G. On the Frouxe-Rabinovitch series for free groups. Portugaliae mathematica, Tome 12 (1953) no. 3, pp. 115-118. http://geodesic.mathdoc.fr/item/PORMA_1953__12_3_114720/